Build Clang 13 on CentOS 7

centos7-clang13.md

Build Clang 13 on CentOS 7

Requirements [1]:

• CMake >=3.13.4
• GCC >=7.1.0
• Python >=3.6 (automated test suite)
• zlib >=1.2.3.4
• GNU Make >=3.79

Notes:

• Extracted source occupies ~1.3 GB
• Configure with CMAKE_BUILD_TYPE=Release, which defaults to Debug
• Build of LLVM, Clang and LLD uses ~4 GB extra disk space
• Build takes ~42 minutes on Xeon E5-2630v4 (2.2 GHz) with 8 jobs
• Installation uses ~1.8 GB

1. Install dependencies

   $ yum -y install centos-release-scl
   $ yum makecache fast
   $ yum -y install devtoolset-11 cmake3
   

2. Download source tarball and extract

   $ wget https://github.com/llvm/llvm-project/archive/refs/tags/llvmorg-13.0.1.tar.gz \
         -O llvm-project-llvmorg-13.0.1.tar.gz
   $ tar xf llvm-project-llvmorg-13.0.1.tar.gz
   $ cd llvm-project-llvmorg-13.0.1
   

3. Build

   $ . /opt/rh/devtoolset-11/enable
   $ cmake3 -S llvm -B build -G 'Unix Makefiles' \
         -DLLVM_ENABLE_PROJECTS='clang;lld' \
         -DCMAKE_BUILD_TYPE=Release
   $ cmake3 --build build -j8
   

4. Install

   $ cmake3 --install build
   

References

[1] LLVM Requirements